Projection visibility control system

Abstract

To provide a control system which can effectively use an external light injected from an external light introduction part.SOLUTION: A control system comprises: an illumination light part 5 that can freely adjust an illumination light amount for illuminating an inner side of an object room 4 having a projection surface 3 in which a projection object is projected by a projection part 2; a control part that controls an external light adjustment part 7 that can freely adjust an external light injection amount injected into the inner side of the object room 4 from an outside of the object room via an external light introduction part 6; and a projection surface illumination degree detection part 9 that detects an illumination degree of the projection surface 3. The control part executes a projection surface illumination maintaining control for controlling an operation state of the illumination light part 5 and the external light adjustment part 7 so as to maintain a setting projection surface illumination degree of which the illumination degree of the projection surface 3 is previously set on the basis of detection information of the projection surface illumination degree detection part 9. In the projection surface illumination degree maintaining control, a light reduction operation of the illumination light part 5 is performed in prior than the light reduction operation of the external light adjustment part 7 in the case where the illumination degree of the projection surface 3 exceeds the setting projection surface illumination degree.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a projection visibility control system that is equipped with an illumination unit that can adjust the amount of illumination light that illuminates a target room having a projection surface onto which a projection object is projected by a projection unit, a control unit that controls an external light adjustment unit that can adjust the amount of external light incident into the target room from outside the target room through an external light introduction unit, and a projection surface illuminance detection unit that detects the illuminance of the projection surface. [Background technology]

[0002] Patent document 1 shows a projection visibility control system that is equipped with a lighting unit (lighting fixture 80) that can adjust the amount of illumination light illuminating a target room (bathroom R2) having a wall surface (R2M) onto which a projection object is projected by a projection unit (projection means 20), a control unit (control means 7) that controls an external light adjustment unit (external light adjustment means 83) that can adjust the amount of external light incident into the target room from outside the target room through an external light introduction unit (window R2W), and an illuminance detection unit (illuminance detection means 81) that detects the illuminance inside the target room. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-127873 A Summary of the Invention [Problem to be solved by the invention]

[0004] This projection visibility control system controls the operating states of the lighting unit and external light adjustment unit to achieve a memorized illuminance based on the illuminance in the target room, but in order to save energy, it is considered to make more effective use of the external light from the external light introduction unit.

[0005] In view of this situation, a main object of the present invention is to provide a control system that can effectively utilize the external light entering through the external light introducing section. [Means for solving the problem]

[0006] The first characteristic configuration of the present invention is a control unit that controls an illumination unit that can adjust the amount of illumination light that illuminates a target room having a projection surface on which a projection target is projected by a projection unit and an external light adjustment unit that can adjust the amount of external light incident into the target room from outside the target room through an external light introduction unit; a projection surface illuminance detection unit that detects the illuminance of the projection surface, The control unit executes projection surface illuminance maintenance control that controls the operating states of the illumination unit and the external light adjustment unit so that the illuminance of the projection surface is maintained at a preset set projection surface illuminance based on detection information from the projection surface illuminance detection unit, and in the projection surface illuminance maintenance control, if the illuminance of the projection surface exceeds the set projection surface illuminance, the control unit gives priority to dimming operation of the illumination unit over dimming operation of the external light adjustment unit.

[0007] According to this configuration, when the illuminance of the projection surface exceeds the set projection surface illuminance, the projection surface illuminance maintenance control prioritizes dimming operation of the lighting unit over dimming operation of the external light adjustment unit to reduce the illuminance of the projection surface. This makes it easier to make effective use of the external light entering through the external light introducing unit, for example, by dimming the lighting unit and reducing the illuminance of the projection surface to the set projection surface illuminance without reducing the amount of external light entering through the external light introducing unit.

[0008] A second characteristic configuration of the present invention is that, in the projection surface illuminance maintenance control, when the illuminance of the projection surface is less than the set projection surface illuminance, the control unit prioritizes the brightening operation of the external light adjustment unit over the brightening operation of the illumination unit.

[0009] According to this configuration, when the illuminance of the projection surface is less than the set projection surface illuminance, the projection surface illuminance maintenance control prioritizes the brightening operation of the external light adjustment unit over the brightening operation of the illumination unit to increase the illuminance of the projection surface. Therefore, for example, the illuminance of the projection surface can be increased to the set projection surface illuminance by increasing the amount of external light incident from the external light introducing unit without increasing the brightness of the illumination unit, making it easier to make more effective use of the external light incident from the external light introducing unit.

[0010] A third characteristic configuration of the present invention includes a work plane illuminance detection unit that detects illuminance on a work plane different from the projection plane in the target room, The control unit executes work surface illuminance maintenance control that controls the operating state of the lighting unit so that the illuminance of the work surface is maintained at a preset set work surface illuminance based on detection information from the work surface illuminance detection unit, and executes the work surface illuminance maintenance control with priority over the projection surface illuminance maintenance control.

[0011] According to this configuration, by executing work surface illuminance maintenance control in priority over projection surface illuminance maintenance control, it becomes easier to maintain the illuminance of a work surface different from the projection surface, such as a floor surface or a desk top surface, at a set work surface illuminance. Therefore, it is possible to make the projection target projected onto the projection surface easier to see to a certain extent, while ensuring illuminance at the hands of the room occupant, making it easier for the room occupant to perform work at hand.

[0012] A fourth characteristic configuration of the present invention is that the control unit includes an illuminance setting unit that can freely change and set the set projection surface illuminance based on the content of a projection target projected by the projection unit.

[0013] According to this configuration, the set projection surface illuminance can be changed depending on the content of the projection object projected onto the projection surface. For example, if the projection object is a moving image, the set projection surface illuminance can be set low so that the projection object is easy to see, and if the projection object is a still image, the set projection surface illuminance can be set high so that it is easy to take notes. In other words, the illuminance of the projection surface can be changed to an illuminance appropriate for the projection object.

[0014] A fifth characteristic configuration of the present invention is that the control unit includes a projection state acquisition unit that acquires information indicating a state of the projection unit, and when the projection state acquisition unit acquires information indicating that the projection unit has started projection, the control unit turns off the illumination unit and dims the illumination unit and the external light adjustment unit so as to minimize the amount of external light entering from the external light introduction unit, and then executes the projection surface illuminance maintenance control.

[0015] According to this configuration, the lighting unit is turned off and the amount of external light entering from the external light introducing unit is reduced to a minimum, and then projection surface illuminance maintenance control is performed. When an illuminance with a certain range is set as the set projection surface illuminance, the lighting unit and external light adjustment unit increase the brightness toward the lowest illuminance within the range of the set projection surface illuminance in the projection surface illuminance maintenance control. This makes it possible to make the illuminance of the projection surface relatively low while maintaining the illuminance of the projection surface at the set projection surface illuminance, making it easier to see the projection object projected onto the projection surface. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram showing a target room in which a projection visibility control system according to a first embodiment is installed; [Diagram 2] A control block diagram of a projection visibility control system in a first embodiment. [Diagram 3] 1 is a flowchart of visibility control by a control unit according to a first embodiment. [Figure 4] Flowchart of wall surface illuminance maintenance control by the control unit in the first embodiment [Diagram 5] A control block diagram of a projection visibility control system in a second embodiment. [Figure 6] 11 is a flowchart of visibility control by a control unit in the second embodiment. [Figure 7] Flowchart of wall surface illuminance maintenance control by the control unit in the second embodiment [Figure 8] FIG. 13 is a diagram showing a target room in which a projection visibility control system according to a third embodiment is installed. [Figure 9] A control block diagram of a projection visibility control system according to a third embodiment. [Figure 10] 11 is a flowchart of visibility control by a control unit in the third embodiment. [Figure 11] 13 is a flowchart showing the work surface illuminance maintenance control and the wall surface illuminance maintenance control of the control unit in the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] [First embodiment] A first embodiment of a projection visibility control system according to the present invention will be described with reference to the drawings. As shown in Figures 1 and 2, the projection visibility control system 1 is equipped with a lighting unit 5 that can adjust the amount of illumination light illuminating a target room 4 having a projection wall surface 3, which is a projection surface onto which a projection target is projected by a projection unit 2, a control unit 8 that controls an external light adjustment unit 7 that can adjust the amount of external light incident from outside the target room into the target room 4 through an external light introduction unit 6, and a wall illuminance detection unit 9 that serves as a projection surface illuminance detection unit that detects the illuminance of the projection wall surface 3.

[0018] The target room 4 may be a room having various shapes, such as a rectangular or sector-shaped planar shape, and a part of the wall surfaces 18 that form the target room 4 is used as the projection wall surface 3. In this embodiment, the target room 4 is a room such as a rectangular parallelepiped conference room, and one of the four wall surfaces 18 that form the target room 4 is used as the projection wall surface 3. Then, the projection target is projected by a projection unit 2 such as a projector installed on a ceiling surface 11 of the target room 4. The lighting unit 5 is composed of lighting fixtures or the like having a function of adjusting the amount of illumination light, and a plurality of lighting units are installed in the target room 4, for example, on the ceiling surface 11 or the like. The external light introducing section 6 is a window installed so as to admit external light from an adjacent room such as an entrance as the outside of the target room or from the outdoors, and is installed on a wall surface 18 different from the projection wall surface 3, for example. The external light adjustment section 7 is composed of blinds installed to cover the external light introduction section 6, and the amount of external light entering the room can be freely adjusted by raising and lowering the blinds or changing the angle of the blades using power from a drive section such as a motor. The wall surface illuminance detection unit 9 is installed at a location on the projection wall 3 other than a projection range 10 onto which the projection unit 2 projects the projection target.

[0019] Based on the detection information from the wall illuminance detection unit 9, the control unit 8 executes wall illuminance maintenance control (corresponding to projection surface illuminance maintenance control) that controls the operating states of the lighting unit 5 and the external light adjustment unit 7 so that the illuminance of the projection wall 3 is maintained at a preset set wall illuminance (corresponding to a set projection surface illuminance). In the wall illuminance maintenance control, when the illuminance of the projection wall 3 exceeds the set wall illuminance, the control unit 8 gives priority to the dimming operation of the illumination unit 5 over the dimming operation of the external light adjustment unit 7.

[0020] In this embodiment, the set wall illuminance is set to about half the brightness of the work surface (500 Lx) of a typical conference room, and specifically, the set wall illuminance is set to 200 Lx. The wall illuminance maintenance control controls the operating states of the lighting unit 5 and the external light adjustment unit 7 based on the detection information of the wall illuminance detection unit 9 so as to maintain the illuminance of the projection wall 3 at or below the preset wall illuminance. The control unit 8 also includes a projection status acquisition unit 13 that acquires various pieces of information transmitted from the projection unit 2. For example, the projection unit 2 transmits projection start information indicating that the projection unit 2 has started projection and projection end information indicating that the projection unit 2 has ended projection, and the control unit 8 is configured to acquire the received projection start information and projection end information using the projection status acquisition unit 13.

[0021] To explain further what happens when the illuminance of the projection wall 3 exceeds the set wall illuminance, in the wall illuminance maintenance control, when the illuminance of the projection wall 3 exceeds the set wall illuminance and the lighting unit 5 is turned on, the lighting unit 5 is controlled to dim the light until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or until the lighting unit 5 is turned off. In addition, in the wall illuminance maintenance control, when the illuminance of the projection wall 3 exceeds the set wall illuminance and the lighting unit 5 is turned off, the external light adjustment unit 7 is controlled to dim the external light adjustment unit 7 until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or until the external light adjustment unit 7 becomes fully closed (a state in which the external light adjustment unit 7 minimizes the amount of external light entering from the external light introduction unit 6). In the wall illuminance maintenance control, when the illuminance of the projection wall 3 is equal to or lower than the set wall illuminance, the current state of the illumination unit 5 and the external light adjustment unit 7 is maintained. In this way, in the wall illuminance maintenance control, when the illuminance of the projection wall 3 exceeds the set wall illuminance, the control unit 8 prioritizes the dimming operation of the lighting unit 5 over the dimming operation of the external light adjustment unit 7.

[0022] Next, the visibility control by the control unit 8 will be described with reference to the flowcharts shown in FIG. 3 and FIG. As shown in Fig. 3, when the projection start information transmitted when the projection unit 2 starts projection is acquired by the projection state acquisition unit 13 (if Yes in step S1), the control unit 8 executes the wall illuminance maintenance control (step S2). When the projection end information is not received after the wall illuminance maintenance control is completed (if No in step S3), the control unit 8 waits for a first set time (for example, waits for one minute, step S4) and then executes the next wall illuminance maintenance control (step S2). In addition, when the projection end information is acquired by the projection state acquisition unit 13 after the execution of the wall illuminance maintenance control (if Yes in step S3), the control unit 8 does not execute the next wall illuminance maintenance control until the projection start information is received (if No in step S1).

[0023] As shown in FIG. 4, in the wall illuminance maintenance control, if the illuminance of the projection wall 3 exceeds the set wall illuminance based on the detection information of the wall illuminance detection unit 9 (Yes in step S11) and the lighting unit 5 is turned on (Yes in step S12), lighting dimming control is executed to dim the lighting unit 5 until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or the lighting unit 5 is turned off (step S13). In addition, in the wall illuminance maintenance control, if the illuminance of the projection wall 3 exceeds the set wall illuminance based on the detection information of the wall illuminance detection unit 9 (Yes in step S11) and the lighting unit 5 is not turned on (No in step S12), and the external light adjustment unit 7 is not fully closed (No in step S14), external light dimming control is executed to dim the external light adjustment unit 7 until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or the external light adjustment unit 7 becomes fully closed (step S15). In addition, in the wall illuminance maintenance control, if the illuminance of the projection wall 3 is equal to or lower than the set wall illuminance (No in step S11), or if the lighting unit 5 is turned off (No in step S12) and the external light adjustment unit 7 is fully closed (Yes in step S14), the current status of the lighting unit 5 and the external light adjustment unit 7 is maintained.

[0024] Then, when illumination dimming control is executed (step S13), when external light dimming control is executed (step S15), or when the illuminance of the projection wall 3 is equal to or lower than the set wall illuminance at the start of execution of the wall illuminance maintenance control (No in step S11), the wall illuminance maintenance control is terminated.

[0025] Second Embodiment Next, a second embodiment of the projection visibility control system according to the present invention will be described with reference to the drawings. In describing the second embodiment of the projection visibility control system, the configuration different from the first embodiment will be mainly described, and the description of the same configuration as the first embodiment will be omitted.

[0026] The control unit 8 is configured to be able to receive various information transmitted from the projection unit 2, and the projection unit 2 transmits projection content information, which is information indicating the content of the projection target to be projected, together with the projection start information, in addition to the projection start information and projection end information, and the control unit 8 is configured to receive the projection start information, projection end information, and projection content information. In this embodiment, the projection unit 2 receives, as the projection content information, information indicating whether the projection target is a projection target having content mainly consisting of character text or a projection target having content mainly consisting of still images.

[0027] As shown in FIG. 5, the control unit 8 includes an illuminance setting unit 12 that can freely change the set wall surface illuminance based on the content of the projection target projected by the projection unit 2. In this embodiment, the set wall illuminance is set to an illuminance having a predetermined range. Specifically, for example, the illuminance setting unit 12 is configured to execute a wall illuminance setting control such that, when it is determined based on the received projection content information that the projection target is mainly still images, the set wall illuminance is set to a range of 100Lx to 200Lx, and when it is determined based on the received projection content information that the projection target is mainly text, the set wall illuminance is set to a range of 150Lx to 250Lx. The wall illuminance maintenance control controls the operating state of the lighting unit 5 and the external light adjustment unit 7 based on the detection information of the wall illuminance detection unit 9 so that the illuminance of the projection wall 3 is maintained within a preset range of the set wall illuminance. The illuminance setting unit 12 may be configured to freely change and set the set wall illuminance based on the user's manual operation of an operation unit or the like installed in the target room 4 or the like.

[0028] To explain further about the case where the illuminance of the projection wall surface 3 is less than the set wall illuminance (for example, less than 100 Lx), in the wall illuminance maintenance control, when the illuminance of the projection wall surface 3 is less than the set wall illuminance and the external light adjustment unit 7 is not fully open (the external light adjustment unit 7 is in a state in which the amount of external light entering from the external light introduction unit 6 is the greatest), the external light adjustment unit 7 is controlled to increase the brightness until the illuminance of the projection wall surface 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or the external light adjustment unit 7 becomes fully open. In addition, in the wall illuminance maintenance control, when the illuminance of the projection wall 3 is less than the set wall illuminance and the external light adjustment unit 7 is fully open, the lighting unit 5 is controlled to increase the brightness until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or until the lighting unit 5 is fully lit (the lighting unit 5 is in the brightest state). Furthermore, if the illuminance of the projection wall 3 exceeds the set wall illuminance (for example, exceeds 200 Lx), wall illuminance maintenance control is executed as in the first embodiment, and in the wall illuminance maintenance control, if the illuminance of the projection wall 3 is within the range of the set wall illuminance (for example, 100 Lx or more and 200 Lx or less), the current state of the lighting unit 5 and the external light adjustment unit 7 is maintained. In this way, in the wall illuminance maintenance control, when the illuminance of the projection wall 3 is less than the set wall illuminance, the control unit 8 prioritizes the brightening operation of the external light adjustment unit 7 over the brightening operation of the illumination unit 5.

[0029] The control unit 8 is provided with a projection state acquisition unit 13 that acquires projection start information (information indicating the state of the projection unit 2), and is configured to, when the projection state acquisition unit 13 acquires information indicating that the projection unit 2 has started projection, turn off the illumination unit 5 and dim the illumination unit 5 and the external light adjustment unit 7 so as to minimize the amount of external light entering from the external light introduction unit 6, and then execute wall surface illuminance maintenance control. In other words, when the control unit 8 receives and acquires projection start information from the projection unit 2, it is configured to execute the darkest dimming control, which turns off the lighting unit 5 and dims the external light adjustment unit 7 so as to bring the external light adjustment unit 7 to a fully closed state, before starting to execute the wall surface illuminance maintenance control.

[0030] Next, the visibility control of the control unit 8 will be described with reference to the flowcharts shown in Fig. 6 and Fig. 7. Note that, in describing the visibility control of the control unit 8, a case where the content of the projection target projected by the projection unit 2 is mainly still images (a case where the set wall surface illuminance is set to 100 Lx or more and 200 Lx or less) will be described.

[0031] 6, when the projection start information transmitted when the projection unit 2 starts projection is acquired by the projection state acquisition unit 13 (if Yes in step S21), the control unit 8 executes the wall illuminance setting control to set the set wall illuminance (step S22), executes the darkest dimming control to turn off the illumination unit 5, and causes the illumination unit 5 and the external light adjustment unit 7 to be in a fully closed state (step S23), and then executes the wall illuminance maintenance control (step S24). If the projection end information is not received after the wall illuminance maintenance control is completed (if No in step S25), the control unit 8 waits for a first set time (for example, waits for 10 minutes, step S26) and then executes the next wall illuminance maintenance control (step S24). In addition, if the projection end information is acquired by the projection state acquisition unit 13 after the wall surface illuminance maintenance control is executed (if Yes in step S25), the next wall surface illuminance maintenance control is not executed until the projection start information is received (if No in step S21).

[0032] 7, in the wall illuminance maintenance control, if the illuminance of the projection wall 3 based on the detection information of the wall illuminance detection unit 9 is less than the set wall illuminance (less than 100 Lx, in the case of Yes in step S31) and the external light adjustment unit 7 is not in a fully open state (in the case of No in step S32), external light increase control is executed to increase the external light adjustment unit 7 until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or until the external light adjustment unit 7 becomes in a fully open state (step S33). When the external light increase control is executed, after waiting for a second set time shorter than the first set time (for example, waiting for 5 seconds, step S36), the set wall illuminance is judged again (step S31). In the external light increase control of this embodiment, the brightness is increased all at once based on the difference between the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 and the set wall illuminance until the illuminance of the projection wall 3 becomes the set wall illuminance or the external light introducing unit 6 becomes fully open, but the brightness may be increased stepwise by a set amount at set time intervals (e.g., 5 seconds) until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or the external light introducing unit 6 becomes fully open.

[0033] In the wall illuminance maintenance control, when the illuminance of the projection wall 3 based on the detection information of the wall illuminance detection unit 9 is less than the set wall illuminance (less than 100 Lx, if Yes in step S31) and the external light adjustment unit 7 is fully open (if Yes in step S32), and the illumination unit 5 is not fully lit (if No in step S34), illumination increase control is executed to increase the brightness of the illumination unit 5 until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or the illumination unit 5 becomes fully lit (step S35). When the illumination increase control is executed, after waiting for a second set time (for example, waiting for 5 seconds, step S36), the set wall illuminance is judged again (step S31). In the illumination increase operation of this embodiment, the illumination is increased all at once based on the difference between the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 and the set wall illuminance until the illuminance of the projection wall 3 reaches the set wall illuminance or the lighting unit 5 is fully lit, but the illumination may be increased stepwise by a set amount at set time intervals until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 reaches the set wall illuminance or the lighting unit 5 is fully lit.

[0034] In the wall illuminance maintenance control, if the illuminance of the projection wall 3 exceeds the set wall illuminance based on the detection information of the wall illuminance detection unit 9 (exceeds 200 Lx, if Yes in step S37) and the illumination unit 5 is turned on (if Yes in step S38), illumination dimming control is executed to dim the illumination unit 5 until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or the illumination unit 5 is turned off (step S39). If illumination dimming control is executed, after waiting for a second set time (for example, waiting for 5 seconds, step S42), the set wall illuminance is judged again (step S31). In the illumination dimming operation of this embodiment, the illumination is dimmed all at once based on the difference between the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 and the set wall illuminance, until the illuminance of the projection wall 3 reaches the set wall illuminance or the illumination unit 5 is turned off. However, the illumination may be dimmed stepwise by a set amount at set time intervals until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 reaches the set wall illuminance or the illumination unit 5 is turned off.

[0035] In the wall illuminance maintenance control, if the illuminance of the projection wall 3 exceeds the set wall illuminance based on the detection information of the wall illuminance detection unit 9 (exceeds 200 Lx, if Yes in step S37) and the lighting unit 5 is not turned on (if No in step S38), and the external light adjustment unit 7 is not fully closed (if No in step S40), external light dimming control is executed to dim the external light adjustment unit 7 until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or the external light adjustment unit 7 becomes fully closed (step S41). If the external light dimming control is executed, the set wall illuminance is judged again after waiting for a second set time (for example, waiting for 5 seconds, step S42) (step S31). In the external light dimming control of this embodiment, the light is dimmed all at once based on the difference between the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 and the set wall illuminance, until the illuminance of the projection wall 3 becomes the set wall illuminance or the external light introducing unit 6 becomes fully closed. However, the light may be dimmed stepwise by a set amount at set time intervals until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or the external light introducing unit 6 becomes fully closed.

[0036] If the illuminance of the projection wall surface 3 is within the range of the set wall surface illuminance (not less than 100 Lx and not more than 200 Lx) (No in step S31, No in step S37), the wall surface illuminance maintenance control is ended.

[0037] Third Embodiment Next, a third embodiment of the projection visibility control system according to the present invention will be described with reference to the drawings. In describing the third embodiment of the projection visibility control system, the configuration different from the second embodiment will be mainly described, and the description of the same configuration as the second embodiment will be omitted.

[0038] As shown in Fig. 8 and Fig. 9, the projection visibility control system 1 is provided with a work surface illuminance detection unit 16 that detects the illuminance of a work surface 15 in a target room. The work surface 15 is a floor surface 19 in the target room 4 or the top surface of a desk installed in the target room 4, and the work surface illuminance detection unit 16 is installed at a position where it can detect the illuminance of the work surface 15. In the example shown in Fig. 8, the floor surface 19 in the target room 4 is the work surface 15, and the work surface illuminance detection unit 16 is installed on the floor surface 19, but for example, the top surface of a desk installed in the target room 4 may be the work surface 15, or the work surface illuminance detection unit 16 may be installed on the ceiling surface 11 facing the work surface 15. The control unit 8 executes work surface illuminance maintenance control, which controls the operating states of the lighting unit 5 and the external light adjustment unit 7 so that the illuminance of the work surface 15 is maintained at a preset set work surface illuminance based on the detection information of the work surface illuminance detection unit 16, and executes the work surface illuminance maintenance control with priority over the wall surface illuminance maintenance control.

[0039] In this embodiment, the set work surface illuminance is set to a value higher than the set wall surface illuminance, specifically, the set work surface illuminance is set to 300 Lx. The work surface illuminance maintenance control controls the operating states of the lighting unit 5 and the external light adjustment unit 7 based on the detection information of the work surface illuminance detection unit 16 so as to maintain the illuminance of the work surface 15 at or above the preset set work surface illuminance.

[0040] To explain further the case where the illuminance of the work surface 15 is less than the set work surface illuminance, in the work surface illuminance maintenance control, when the illuminance of the work surface 15 is less than the set work surface illuminance and the lighting unit 5 is not fully lit, the lighting unit 5 is controlled to increase the brightness until the illuminance of the work surface 15 detected by the work surface illuminance detection unit 16 becomes the set work surface illuminance or the lighting unit 5 is fully lit, regardless of the illuminance of the projection wall surface 3 detected by the wall surface illuminance detection unit 9. In this way, in the work surface illuminance maintenance control, when the illuminance of the projection wall surface 3 is less than the set work surface illuminance, the control unit 8 only performs the brightening operation of the lighting unit 5 out of the brightening operation of the lighting unit 5 and the brightening operation of the external light adjustment unit 7.

[0041] Next, the visibility control by the control unit 8 will be described with reference to the flowcharts shown in Fig. 10 and Fig. 11. Note that, in describing the visibility control by the control unit 8, a case where the content of the projection target projected by the projection unit 2 is mainly still images (a case where the set wall surface illuminance is set to 100 Lx or more and 200 Lx or less) will be described.

[0042] 10, when the projection start information transmitted when the projection unit 2 starts projection is acquired by the projection state acquisition unit 13 (if Yes in step S51), the control unit 8 executes the wall surface illuminance setting control to set the set wall surface illuminance (step S52), executes the darkest dimming control to turn off the illumination unit 5, and causes the illumination unit 5 and the external light adjustment unit 7 to be in a fully closed state (step S53), and then executes the work surface illuminance maintenance control and the wall surface illuminance maintenance control (step S54). If the projection end information is not received after the work surface illuminance maintenance control and the wall surface illuminance maintenance control are completed (if No in step S55), the control unit 8 waits for a first set time (for example, waits for 10 minutes, step S56) and then executes the next work surface illuminance maintenance control and the wall surface illuminance maintenance control (step S54). In addition, if the projection end information is acquired by the projection state acquisition unit 13 after the work surface illuminance maintenance control and the wall surface illuminance maintenance control are executed (if Yes in step S55), the next work surface illuminance maintenance control and wall surface illuminance maintenance control are not executed until the projection start information is received (if No in step S51).

[0043] The control unit 8 gives priority to and executes the work surface illuminance maintenance control over the wall surface illuminance maintenance control. In the work surface illuminance maintenance control, if the illuminance of the work surface 15 is less than the set work surface illuminance based on the detection information of the work surface illuminance detection unit 16 (less than 300 Lx, if Yes in step S61) and the illumination unit 5 is not fully lit (if No in step S62), illumination increase control is executed to increase the brightness of the illumination unit 5 until the illuminance of the work surface 15 detected by the work surface illuminance detection unit 16 becomes the set work surface illuminance or the illumination unit 5 becomes fully lit (step S63). If illumination increase control is executed, after waiting for a second set time (for example, waiting for 5 seconds, step S64), the set work surface illuminance is judged again (step S61).

[0044] If the illuminance of the work surface 15 is equal to or greater than the set work surface illuminance (No in step S61), wall illuminance maintenance control is executed, and if the illuminance of the projection wall surface 3 is less than the set wall illuminance based on the detection information of the wall illuminance detection unit 9 (less than 100 Lx, Yes in step S65) and the external light adjustment unit 7 is not fully open (No in step S66), external light increase control is executed to increase the external light adjustment unit 7 until the illuminance of the projection wall surface 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or until the external light adjustment unit 7 becomes fully open (step S67). If the external light increase control is executed, the set work surface illuminance is judged again after waiting for a second set time (e.g., waiting for 5 seconds, step S70) (step S61).

[0045] In the wall illuminance maintenance control, when the illuminance of the projection wall 3 based on the detection information of the wall illuminance detection unit 9 is less than the set wall illuminance (less than 100 Lx, if Yes in step S65) and the external light adjustment unit 7 is fully open (if Yes in step S66), and the lighting unit 5 is not fully lit (if No in step S68), the lighting increase control is executed to increase the brightness of the lighting unit 5 until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or the lighting unit 5 becomes fully lit (step S69). When the lighting increase control is executed, after waiting for a second set time (for example, waiting for 5 seconds, step S70), the set work surface illuminance is judged again (step S61).

[0046] In the wall illuminance maintenance control, if the illuminance of the projection wall 3 exceeds the set wall illuminance based on the detection information of the wall illuminance detection unit 9 (exceeds 200 Lx, if Yes in step S71) and the illumination unit 5 is turned on (if Yes in step S72), illumination dimming control is executed to dim the illumination unit 5 until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or the illumination unit 5 is turned off (step S73). If illumination dimming control is executed, after waiting for a second set time (for example, waiting for 5 seconds, step S76), the set work surface illuminance is judged again (step S61).

[0047] In the wall illuminance maintenance control, if the illuminance of the projection wall 3 exceeds the set wall illuminance based on the detection information of the wall illuminance detection unit 9 (exceeds 200 Lx, if Yes in step S71) and the lighting unit 5 is not turned on (if No in step S72), and the external light adjustment unit 7 is not fully closed (if No in step S74), external light dimming control is executed to dim the external light adjustment unit 7 until the illuminance of the projection wall 3 detected by the wall illuminance detection unit 9 becomes the set wall illuminance or the external light adjustment unit 7 becomes fully closed (step S75). If the external light dimming control is executed, after waiting for a second set time (for example, waiting for 5 seconds, step S76), the set work surface illuminance is judged again (step S61).

[0048] In the work surface illuminance maintenance control and the wall surface illuminance maintenance control, if the illuminance of the work surface 15 is equal to or greater than the set work surface illuminance (300 Lx or more) and the illuminance of the projection wall surface 3 is within the range of the set wall surface illuminance (100 Lx or more and 200 Lx or less) (if No in step S61, if No in step S65, if No in step S71), the work surface illuminance maintenance control and the wall surface illuminance maintenance control are terminated.

[0049] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied alone, but may also be applied in combination with the configurations of other embodiments.

[0050] (1) In the above first embodiment, the configuration is such that the set wall illuminance is a constant value regardless of the content of the projection target projected by the projection unit 2, and in the above second and third embodiments, an example is described in which a wall illuminance setting control is executed to change and set the set wall illuminance based on the content of the projection target projected by the projection unit 2. However, in the above first embodiment, the configuration may be such that the wall illuminance setting control is executed, and in the above second and third embodiments, the configuration may be such that the set wall illuminance is a constant value regardless of the content of the projection target projected by the projection unit 2.

[0051] (2) In the above third embodiment, an example has been described in which the illuminance of the work surface 15 is maintained at a preset set work surface illuminance by controlling the operating state of only the illuminating unit 5 out of the illuminating unit 5 and the external light adjusting unit 7 in the work surface illuminance maintenance control. However, the illuminance of the work surface 15 may be maintained at a preset set work surface illuminance by controlling the operating states of both the illuminating unit 5 and the external light adjusting unit 7 in the work surface illuminance maintenance control.

[0052] (3) In the above embodiment, the external light adjustment unit 7 is described as a blind as an example, but the external light adjustment unit 7 may be any device that can adjust the amount of external light entering through the external light introduction unit 6, such as a curtain or instantaneous dimming glass that can adjust the amount of light transmitted through.

[0053] (4) In the above embodiment, an example was described in which the wall surface 18 adjacent to the wall surface 18 on which the external light introducing unit 6 is installed is used as the projection surface. However, for example, the portion of the wall surface 18 on which the external light introducing unit 6 is installed that is above the external light introducing unit 6, or the wall surface 18 opposite the wall surface 18 on which the external light introducing unit 6 is installed, may also be used as the projection surface, and further, the ceiling surface 11 may also be used as the projection surface.

[0054] (5) In the above embodiment, an example is described in which the lighting unit 5 is installed on the ceiling surface 11 and the external light introducing unit 6 is installed on the wall surface 18, but the lighting unit 5 and the external light introducing unit 6 can be installed in any suitable location within the target room 4. [Explanation of symbols]

[0055] 1 Visibility control system for projection 2 Projection section 3 Projection wall surface (projection surface) 4. Target room 5. Lighting Section 6 External light introduction section 7. External light adjustment section 8. Control Unit 9 Wall surface illuminance detection unit (projection surface illuminance detection unit) 12 Illuminance setting section 13 Projection status acquisition unit 15 Work Surface 16 Work surface illuminance detection unit 18 Wall

Claims

1. a control unit that controls an illumination unit that can adjust the amount of illumination light that illuminates a target room having a projection surface on which a projection target is projected by a projection unit and an external light adjustment unit that can adjust the amount of external light incident into the target room from outside the target room through an external light introduction unit; a projection surface illuminance detection unit that detects the illuminance of the projection surface, The control unit executes projection surface illuminance maintenance control that controls the operating states of the illumination unit and the external light adjustment unit so that the illuminance of the projection surface is maintained at a preset set projection surface illuminance based on detection information from the projection surface illuminance detection unit, and during the projection surface illuminance maintenance control, if the illuminance of the projection surface exceeds the set projection surface illuminance, the projection surface visibility control system causes the dimming operation of the illumination unit to be performed with priority over the dimming operation of the external light adjustment unit.

2. 2. The projection visibility control system according to claim 1, wherein, in the projection surface illuminance maintenance control, when the illuminance of the projection surface is less than the set projection surface illuminance, the control unit prioritizes the brightening operation of the external light adjustment unit over the brightening operation of the illumination unit.

3. A work surface illuminance detection unit is provided to detect the illuminance of a work surface different from the projection surface in the target room, 3. The projection visibility control system according to claim 1, wherein the control unit executes a work surface illuminance maintenance control that controls the operating state of the lighting unit so that the illuminance of the work surface is maintained at a preset set work surface illuminance based on detection information from the work surface illuminance detection unit, and executes the work surface illuminance maintenance control in priority to the projection surface illuminance maintenance control.

4. 3. The projection visibility control system according to claim 1, wherein the control unit includes an illuminance setting unit that can freely change and set the set projection surface illuminance based on the content of a projection target projected by the projection unit.

5. 3. The projection visibility control system according to claim 1, wherein the control unit includes a projection state acquisition unit that acquires information indicating a state of the projection unit, and when the projection state acquisition unit acquires information indicating that the projection unit has started projection, the control unit turns off the illumination unit and dims the illumination unit and the external light adjustment unit so as to minimize the amount of external light entering from the external light introduction unit, and then executes the projection surface illuminance maintenance control.

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